Rise through the Serbian hierarchy
Gabriel entered church service and advanced through the episcopate of the Serbian Patriarchate of Peć. He became Metropolitan of Smederevo and, in 1643, was elected Metropolitan of Raška. Around 1644 he rebuilt the Monastery of the Holy Archangels in the Kovilje Mountains.
After the death of Patriarch Pajsije I in 1647, Gabriel was elected patriarch in 1648. He held the office until 1655, succeeding Pajsije I and preceding Maksim I in the line of restored patriarchs of Peć (1557–1766).